So on the scale of 1-creepy twincest, I'd say they are not as creepy as The Peters Twins at Bel Ami, who straight-up fucked each other...

From Active Duty:

The twins never hold back and this time they are all in taking turns fucking Dominic and Princeton. Princeton can't tell either one apart but he loves those big cocks buried deep in his eager ass. Dominic and Princeton are seeing double as the twins stuff their massive cocks deep into their throats. Michael and Jacob love to make them gag and they love to pound hard and deep.

There's a little sucking on the front end:

Then the Stax twins return the favor...

In more ways than one.

And in more positions than one too!

Then when the time cums, they all blow their loads on Dominic's face.

Would you fuck the Stax Twins? What do you think of twins having sec with each other?